WO2006103283A1 - Procede pour allouer des flux de donnees descendants dans un systeme d'antennes distribue - Google Patents

Procede pour allouer des flux de donnees descendants dans un systeme d'antennes distribue Download PDF

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Publication number
WO2006103283A1
WO2006103283A1 PCT/EP2006/061211 EP2006061211W WO2006103283A1 WO 2006103283 A1 WO2006103283 A1 WO 2006103283A1 EP 2006061211 W EP2006061211 W EP 2006061211W WO 2006103283 A1 WO2006103283 A1 WO 2006103283A1
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WO
WIPO (PCT)
Prior art keywords
data streams
mobile terminal
antenna system
remote units
distributed antenna
Prior art date
Application number
PCT/EP2006/061211
Other languages
English (en)
Inventor
Guang Jie Li
Xin Chang
Hui Li
Egon Schulz
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP06725459A priority Critical patent/EP1864401A1/fr
Publication of WO2006103283A1 publication Critical patent/WO2006103283A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the present invention relates to an method of optimizing the performance of a radio communication system, and more particularly, to a method for allocating downlink data streams in a distributed antenna system.
  • radio communication systems With the appearance and development of radio communication technology, radio communication systems have developed from analog systems to digital systems, and are now experiencing transition from the second generation to the third generation, i.e. transition from voice communication systems to data communication systems.
  • radio communication resources have always been a crucial factor of great importance optimizing the usage of limited radio communication resources and improving the frequency spectrum usage rate of radio communication resources has become a constant focal point for researchers in the field of communication.
  • MIMO Multiple Input and Multiple Output
  • multiple antenna units i.e. an antenna array
  • a spatial diversity gain is acquired or the transmission speed of radio signals is improved, as shown in Fig. 1.
  • spatial multiplex transmission and spatial diversity transmission are two main transmission schemes, wherein in the spatial multiplex transmission scheme, for example, the V-BLAST (Vertical Bell Laboratories Layered Space Time) scheme proposed by Bell Lab, multiple data streams of a radio signal are transmitted simultaneously through multiple antenna units with a spatial multiplex scheme, and thus the transmission speed of the radio signal can be improved significantly; and, in the spatial diversity transmission scheme, for example, using the STBC (Space Time Block Coded) scheme, multiple data streams of a radio signal are transmitted simultaneously through multiple antenna units with a space-time coding scheme, and thus a spatial diversity gain is acquired and the transmission performance of the radio signal is improved.
  • the gain in transmission speed or transmission performance of a radio signal that can be acquired will increase linearly with the increase in the number of antenna units.
  • a distributed antenna system is a special application form of MIMO radio transmission technology.
  • a distributed antenna system instead of using the concept of a traditional cell BS (Base Station) , provides multiple remote units in each cell, each remote unit including at least one antenna unit and at least one signal transceiving unit, wherein the signal transceiving unit is responsible for the conversion of a BB (Base Band) or IF (Intermediate Frequency) signal to a RF (Radio Frequency) signal or in reverse, and the antenna unit is responsible for transmitting and receiving the RF signal; the multiple remote units are further connected to a central unit which jointly processes radio signals from the multiple remote units; and, an area covered by multiple remote units pertaining to one central unit is called the service area of the distributed antenna system, as shown in Fig.2.
  • a mobile terminal is also provided with at least one antenna unit, and can simultaneously communicate with multiple remote units within the service area in which it is located, with the communication between the mobile terminal and the remote units being performed using MIMO radio transmission technology.
  • the mobile terminal can communicate with a remote terminal in its proximity, which greatly shortens the distances between the mobile terminal and remote units, thereby reducing the transmission power of both the mobile terminal and remote units as well as suppressing mutual interference within the radio communication system; furthermore, since the distance between the mobile terminal and remote units is shortened, when a radio signal is transmitted therebetween, there typically exists at least one line of sight (LOS) , which can further improve the transmission quality of the radio signal.
  • LOS line of sight
  • the distributed antenna system has inherited many advantages of MIMO radio transmission technology, such as high frequency spectrum efficiency, high transmission quality for the radio signal and so on, and can also adopt the link adaptation methods, such as, AMC (Adaptive Modulation and Coding) and power allocation, commonly used in MIMO radio transmission technology.
  • the distributed antenna system is not exactly the same as traditional applications of MIMO radio transmission technology.
  • data streams of a radio signal are transmitted only between a pair of antenna arrays, that is to say, they are limited in a point-to-point radio link, and no in-depth study has been undertaken on the method for allocating the data streams among multiple antenna arrays.
  • the data streams of the radio signal will be completely allocated to N antenna units of the remote unit nearest to the mobile terminal.
  • a mobile terminal in a distributed antenna system, can simultaneously communicate with multiple remote units within the service area in which it is located, that is to say, the mobile terminal can simultaneously establish multiple radio links with the multiple remote units, resulting in the problem of allocating data streams of a radio signal among multiple antenna arrays; and, when a radio signal is transmitted between the mobile terminal and the remote units, there typically exists at least one LOS, and propagation in the LOS will cause correlation of radio channels between different antenna units in the same antenna array, which will impair the transmission performance of the radio signal, thus it is also necessary to allocate the data streams of the radio signal among multiple remote units, which is a problem that cannot be solved by traditional applications of MIMO radio transmission technology.
  • An object of the present invention is to propose a method for allocating downlink data streams in a distributed antenna system, wherein in the downlink radio signal transmission from remote units to a mobile terminal the central unit of the service area in which the mobile terminal is located can allocate data streams of the radio signal among the remote units within its service area according to variations in the position of the mobile terminal and radio signal transmission environment.
  • the method further improves the transmission quality of the radio signal and optimizes the performance of the distributed antenna system.
  • the above object of the present invention is achieved by the following method: a method for allocating downlink data streams in a distributed antenna system, wherein in the downlink radio signal transmission from remote units to a mobile terminal, the central unit of the service area in which the mobile terminal is located allocates data streams of the radio signal among the remote units within its service area, according to the following steps: a) measuring the position in the service area in which the mobile terminal is located; b) measuring the correlation of the downlink radio signals transmitted to the mobile terminal from individual antenna units of all the remote units within the service area; c) the central unit determining the manner in which the data streams are allocated among the remote units based on the position of the mobile terminal and the measured value of the correlation of the downlink radio signals.
  • the central unit allocates corresponding pilot signals to the individual antenna units of all the remote units within its service area so that the pilot signals of the individual antenna units can be distinguished from each other; and, the mobile terminal measures its position and the correlation of the downlink radio signals by measuring large scale channel fading suffered by down pilot signals transmitted by the individual antenna units .
  • the central unit allocates corresponding pilot signals to the individual antenna units of all the remote units within its service area so that the pilot signals of the individual antenna units can be distinguished from each other; and, the mobile terminal measures large scale channel fading suffered by down pilot signals transmitted by the individual antenna units and reports to the central unit the measured values of the large scale channel fading, and then the central unit performs the measurement of the position of the mobile terminal and the correlation of the downlink radio signals.
  • the large scale channel fading comprises radio channel path loss and radio channel shadow fading.
  • the central unit adjusts the manner in which the data streams are allocated among the remote units periodically, based on the measured values .
  • the central unit allocates the data streams in combination with the link adaptation method of adaptive modulation and coding or power allocation, employing corresponding modulation and coding schemes on or allocating different transmission power for different downlink data streams.
  • the distributed antenna system employs an orthogonal frequency division multiple access or code division multiple access scheme.
  • the distributed antenna system employs a time division duplex or frequency division duplex scheme.
  • Fig.l illustrates a schematic of traditional applications of
  • Fig.2 illustrates a schematic of a distributed antenna system.
  • Fig.3 illustrates the first embodiment of the present invention.
  • Fig.4 illustrates the second embodiment of the present invention .
  • FIG.3 Two embodiments of the present invention are shown in Fig.3 and Fig.4, respectively.
  • radio links for transmitting a radio signal from remote units to a mobile terminal are called downlinks; and, radio links for transmitting a radio signal from a mobile terminal to remote units are called uplinks .
  • the central unit of the service area in which the mobile terminal is located allocates data streams of the radio signal among the remote units within its service area, according to the following steps:
  • the central unit determining the manner in which the data streams are allocated among the remote units based on the position of the mobile terminal and the measured value of the correlation of the downlink radio signals.
  • the central unit can allocate corresponding pilot signals to individual antenna units of all the remote units within its service area so that the pilot signals of the individual antenna units can be distinguished from each other; and, the mobile terminal measures its position and the correlation of the downlink radio signals by measuring large scale channel fading suffered by down pilot signals transmitted by the individual antenna units, and reports to the central unit the measurement results of the position and correlation; in view of the limited computing ability of the mobile terminal, the mobile terminal can also report to the central unit the measured values of the large scale channel fading, and then the central unit performs the measurement of the position of the mobile terminal and the correlation of the downlink radio signals; and, the large scale channel fading comprises radio channel path loss and radio channel shadow fading.
  • the precise measurement of the position of the mobile terminal is not necessary, and nor is that of the instantaneous correlation of the downlink radio signals. Therefore, measuring the large scale channel fading can meet the requirements of measuring the position of the mobile terminal and the correlation of the downlink radio signals. According to the concept of the present invention, those skilled in the art can also implement the measurement of the position of the mobile terminal and the correlation of the downlink radio signals with other alternative measuring methods .
  • the central unit determines the manner in which the data streams are allocated among the remote units based on the position of the mobile terminal and the measured value of the correlation of the downlink radio signals. For example, when the correlation of the downlink radio signal is very high, it is supposed to avoid allocating multiple data streams of the radio signal to one of the remote units; and, when the mobile terminal is positioned in the middle of the multiple remote units, it is supposed to allocate the data streams of the radio signal to the multiple remote units as evenly as possible, so as to acquire a macro-diversity gain.
  • Fig.3 illustrates the first embodiment of the present invention.
  • the mobile terminal MT is positioned in the middle of four remote units RUl, RU2, RU3 and RU4, and the antenna array of the mobile terminal MT includes four antenna units; then, according to the method of the present invention, the downlink data streams Streaml, Stream2, Stream3 and Stream4 will be allocated to the four remote units RUl, RU2, RU3 and RU4, respectively.
  • the antenna array of each one of the remote units comprises four antenna units, and the number of the antenna units is larger than that of the data streams allocated thereto, i.e. four antenna units transmitting one data stream.
  • Fig.4 illustrates the second embodiment of the present invention, in which the mobile terminal MT is nearest to the remote unit RUl, while further from the other three remote units RU2, RU3 and RU4.
  • the data stream Streaml can be transmitted simultaneously through two antenna units of the remote unit RUl, and the data streams Stream2 and Stream3 can be transmitted, respectively, through the other two antenna units of the remote unit RUl, and the data stream Stream4 can be transmitted simultaneously through all twelve antenna units of remote units RU2, RU3 and RU4, and thus the transmission quality of the data streams is further improved.
  • the measurement of the position of the mobile terminal and the correlation of the downlink radio signals can be carried out periodically by the central unit, and the central unit adjusts the manner in which the data streams are allocated among the remote units periodically, based on the measured values, to adapt to the variations in the position of the mobile terminal and radio signal transmission environment.
  • the central unit can also perform the allocation of the data streams in combination with the link adaptation method of adaptive modulation and coding or power allocation used in traditional applications of MIMO radio transmission technology, employing corresponding modulation and coding schemes on or allocating different transmission power for different downlink data streams .
  • the method for allocating downlink data streams in a distributed antenna system according to the present invention has been described through the above two embodiments, but it is obvious for those skilled in the art that the distributed antenna system is not limited to the use of a particular multiple access scheme, for example, an orthogonal frequency division multiple access (OFDMA) or code division multiple access (CDMA) scheme can be used; and, the distributed antenna system is also not limited to the use of a particular duplex scheme, for example, a time division duplex (TDD) or frequency division duplex (FDD) scheme can be used.
  • the method of the present invention is applicable to the distributed antenna system using a multiple access or duplex scheme.

Abstract

L'invention concerne un procédé pour allouer des flux de données descendants dans un système d'antennes distribué selon lequel, dans la transmission de signaux radio descendants envoyée par des unités éloignées à un terminal mobile, l'unité centrale de la zone de service dans laquelle se trouve le terminal mobile affecte des flux de données de signaux radio à des unités éloignées à l'intérieur de sa zone de service. Le procédé comporte les opérations suivantes: mesurer la position du terminal mobile dans la zone de service, mesurer la corrélation des signaux radio descendants transmis au terminal mobile par les unités d'antennes individuelles de toutes les unités éloignées à l'intérieur de la zone de service, déterminer au niveau de l'unité centrale le mode d'affectation des flux de données parmi les unités éloignées sur la base de la position du terminal mobile et de la valeur mesurée de la corrélation des signaux radio descendants. Le procédé permet d'affecter des flux de données d'un signal radio à des unités éloignées dans une zone de service en fonction des variations de la position du terminal mobile et de l'environnement de la transmission du signal radio et, comparativement aux applications classiques de la technologie de transmission radio MIMO, il améliore la qualité de transmission des signaux radio et optimise la performance de systèmes d'antennes distribués.
PCT/EP2006/061211 2005-03-31 2006-03-31 Procede pour allouer des flux de donnees descendants dans un systeme d'antennes distribue WO2006103283A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06725459A EP1864401A1 (fr) 2005-03-31 2006-03-31 Procede pour allouer des flux de donnees descendants dans un systeme d'antennes distribue

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200510059760.0 2005-03-31
CN 200510059760 CN1841960B (zh) 2005-03-31 2005-03-31 分布式天线系统中的下行链路数据流分配方法

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WO2006103283A1 true WO2006103283A1 (fr) 2006-10-05

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EP (1) EP1864401A1 (fr)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074925A1 (fr) * 2006-12-21 2008-06-26 Nokia Corporation Procédé et système de communication
US8213533B2 (en) 2008-02-11 2012-07-03 Telefonaktiebolaget Lm Ericsson (Publ) Distributed antenna diversity transmission method
US8909295B2 (en) 2011-02-25 2014-12-09 Fujitsu Limited Transceiver set selection and communication scheme for a distributed antenna system
CN104301013A (zh) * 2008-08-11 2015-01-21 高通股份有限公司 用于在无线通信系统中支持分布式mimo的方法和装置
US8977280B2 (en) 2012-12-20 2015-03-10 Telefonaktiebolaget L M Ericsson (Publ) Node and method for determining link adaptation parameters

Families Citing this family (2)

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US8542763B2 (en) * 2004-04-02 2013-09-24 Rearden, Llc Systems and methods to coordinate transmissions in distributed wireless systems via user clustering
CN101615932B (zh) * 2008-06-25 2013-01-30 鼎桥通信技术有限公司 一种多天线混合自动重发请求系统的功率分配方法

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WO2003085875A1 (fr) * 2002-04-05 2003-10-16 Nortel Networks Limited Procede et dispositif de communication faisant appel au codage spatio-temporel, a la modulation et au codage d'erreur adaptatifs

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US6888809B1 (en) * 2000-01-13 2005-05-03 Lucent Technologies Inc. Space-time processing for multiple-input, multiple-output, wireless systems

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2003085875A1 (fr) * 2002-04-05 2003-10-16 Nortel Networks Limited Procede et dispositif de communication faisant appel au codage spatio-temporel, a la modulation et au codage d'erreur adaptatifs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008074925A1 (fr) * 2006-12-21 2008-06-26 Nokia Corporation Procédé et système de communication
US8208963B2 (en) 2006-12-21 2012-06-26 Nokia Corporation Communication method and system
US8213533B2 (en) 2008-02-11 2012-07-03 Telefonaktiebolaget Lm Ericsson (Publ) Distributed antenna diversity transmission method
CN104301013A (zh) * 2008-08-11 2015-01-21 高通股份有限公司 用于在无线通信系统中支持分布式mimo的方法和装置
CN104301013B (zh) * 2008-08-11 2018-02-02 高通股份有限公司 用于在无线通信系统中支持分布式mimo的方法和装置
US8909295B2 (en) 2011-02-25 2014-12-09 Fujitsu Limited Transceiver set selection and communication scheme for a distributed antenna system
US8977280B2 (en) 2012-12-20 2015-03-10 Telefonaktiebolaget L M Ericsson (Publ) Node and method for determining link adaptation parameters

Also Published As

Publication number Publication date
CN1841960B (zh) 2010-06-23
EP1864401A1 (fr) 2007-12-12
CN1841960A (zh) 2006-10-04

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